Origin of the Zodiacal Cloud by Comet Disruptions

Details Origin of the Zodiacal Cloud by Comet Disruptions Origin of the Zodiacal Cloud by Comet Disruptions

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.2707n&link_type=abstract

American Astronomical Society, DPS meeting #41, #27.07

Astronomy and Astrophysics

Astronomy

Scientific paper

The zodiacal cloud is a thick circumsolar disk of dust particles produced by asteroid
collisions and comets. The relative proportion in which these two source populations
contribute to the zodiacal cloud and the exact physical mechanism that generates the bulk of
observed dust are unknown. Here we model the IRAS observations of thermal emission from asteroid
and cometary particles to explain the origin of the zodiacal cloud. We find that $\approx$2/3
of the observed mid-infrared emission at the ecliptic is produced by dust from the Jupiter-family
comets and $\approx$1/3 from the Oort-cloud comets. These two source populations have similar
contributions to the total flux integrated over the full range of ecliptic latitudes. We find
evidence that comet disruptions, rather than the usual cometary outgassing activity and
asteroid collisions, dominates the overall dust production.

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